POLYMER COMPOSITES
·
2023
·
IF 5.2
Fangfang Liu,Fuqi Feng,Yujie Ji,Jinda Peng,Lei He,Juqing Cui
Polydimethylsiloxane (PDMS) is recognized as an excellent stretchable substrate in wearable electronics, due to its desirable properties such as tensile properties, transparency, thermal stability, non-toxicity, and good biocompatibility. However, its limited fracture toughness and susceptibility to cracking significantly reduce the material's overall durability. In this study, the solution casting method was applied to prepare the nanofibers composites combined stretchable PDMS and aligned electrospun cellulose acetate (CA) to improve its mechanical properties and keep its transparency. The results showed that composites containing 3 wt% loadings of electrospun CA nanofibers exhibited a light transmittance exceeding 85% within the visible light range. Specifically, the PDMS/CA-400 composites exhibited maximum improvements in comparison to pure PDMS. Notably, the tensile strength increased significantly from 2.1 to 3.0 MPa, while the toughness increased from 0.93 to 2.49 MJ/m 3 . In addition, the tensile strength of PDMS/CA-400 composites with pre-cut cracks increased from 0.2 to 1.4 MPa, and the fracture toughness increased from 14.78 to 174.42 kJ/m 3 , which were respectively 7 and 12 times compared to pure PDMS. Scanning electron microscope images showed that PDMS formed good interfacial interaction with CA nanofibers. This study introduces a novel method utilizing electrospun nanofibers to create transparent and fracture-resistant stretchable composites, offering promising enhancements for the durability of wearable electronic devices. Highlights Explore the impact of the speed of receiving rollers on the degree of fiber arrangement. PDMS/CA-400 composite material shows good light transmittance and high fracture resistance. The tight interface between the fiber and the matrix improves the optical transmission and mechanical properties of the composite materials.
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DOI
高影响因子
POLYMER
·
2023
·
IF 4.6
Tingting Zhang,Xiang Wang,Jianyu Liang,Qiang Chen,Jinzheng Huang
Biomass fibers are recognized as degradable and renewable green natural polymer materials. However, research on biomass fiber-based lithium battery separators is still relatively limited. Here, a kind of cellulose diacetate-based composite separator for lithium batteries was investigated via electrostatic spinning technology. In this study, M-CDA/PEO/BM composite separators were obtained by modifying fiber-based nonwovens through deacetylation , followed by an infiltration process and thermal cross-linking reaction to introduce boehmite (BM) and polyethylene oxide (PEO). Wherein the infiltrating solution is composed of polyethylene glycol diglycidyl ether (PEGDE), polyetheramine (DPPG), and boehmite particles. The results demonstrate that this nanofibre composite separator exhibits good heat tolerance (no shrinkage at 200 °C), excellent wettability (contact angles only 15.1°), and high ionic conductivity (2.83 mS cm −1 ) in electrolytes. Additionally, the cells utilizing the composite separator exhibited superior cycle performance and better multiplier performance (170 mAh·g −1 at 0.5C) compared to the polypropylene separator that is currently available in the market, under identical circumstances. This renewable composite possesses remarkable properties that position it as a highly promising option for lithium-ion battery separators with exceptional performance.
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高影响因子
Molecular Catalysis
·
2023
·
IF 4.6
Bin Wu,Shuguang Shen,Cui Wang,Xingting Guo,Huajie Pan,Shuai Wang,Jiemin Guo,Xiaoting Hu,Ruxue Sun,Yongmei Liu,Jing Li
Two different aromatic monomers, naphthalene and benzothiophene, were ingeniously selected to prepare a solid acid with thiophene groups, which can selectively convert cellulose into glucose. The content of thiophene groups in the solid acids was regulated by adjusting the proportion of aromatic monomers. The effect of thiophene groups on physico-chemical structures and catalytic activity of solid acids was discussed. The experiment results indicate that the sulfur content in solid acids was up to 19.57 wt%. The introduction of thiophene groups increased –SO 3 H group density and adsorption capacity by 30.99 % and 64.36 %, respectively. These positive changes result in excellent catalytic activity of solid acids. The cellulose conversion rate and glucose selectivity reached 78.9 % and 97.1 % respectively at 150 °C and 7 h.
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高影响因子
CELLULOSE
·
2023
·Vol. 30
·期 18
·11425-11437
·
IF 5.7
Ruan Hong,Chen Xin,Lv Chunzi,Gu Xingshuai,Zhou Zhijian,Lu Shaorong,Li Yuqi
Cellulose-based composites typically have poor water resistance because they are cross-linked through non-covalent bonds, such as hydrogen bonds. Herein, furan group was grafted onto sisal microcrystalline cellulose fiber (F-MSF) and a dynamic thermally reversible cross-linked network structure was formed with maleimide modified CaCu 3 Ti 4 O 12 (D-CCTO) to obtain recyclable D-CCTO/F-MSF composites (DFF) through the Diels-Alder reaction. The results showed that the mechanical properties of DFF composites were improved due to the improvement of the cross-linked structure between D-CCTO and F-MSF. At 1 wt% D-CCTO content, the tensile strength of DFF was 5.53 MPa, which increased by 346% compared with that of pure MSF. At 5 wt% D-CCTO content, the short-circuit current, open circuit voltage, transferred charge of DFF-based triboelectric nanogenerators (DF-TENG) were 3.2 µA, 85 V and 26 nC, respectively. Additionally, the DF-TENG was able to maintain its electrical performance of more than 60% at an ambient humidity of 90% and was able to light up more than 30 LED bulbs. This research provides new insights into addressing the challenge of poor water resistance in conventional cellulose-based composites, while also designing a recyclable TENG device that can harvest energy in high humidity environments. Graphical abstract
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高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2023
·
IF 8.2
Ran Wang,Na Li,Hui Liu,Ran Li,Lexin Zhang,Zhiwei Liu,Qiuming Peng,Liqun Ren,Jinxia Liu,Bingfan Li,Tifeng Jiao
In recent years, the safety of public health has attracted more and more attention. In order to avoid the spread of bacteria and reduce the diseases caused by their invasion of the human body, novel filtration and antibacterial materials have attracted more and more attention. In this work, the antibacterial agents silver nanoparticles (AgNPs) and cetylpyridine bromide (CPB) were introduced into a cellulose acetate (CA) nanofiber film by electrospinning technology to prepare CA-based composite films with good antibacterial and filtration properties. The results of the antibacterial test of the composite nanofiber films showed that AgNPs and CPB had synergistic antibacterial effects and exhibited good antibacterial properties against a variety of bacteria. In addition, in vitro cytotoxicity, skin irritation and skin sensitization experiments proved that the CA/AgNPs, CA/CPB and CA/CPB/AgNPs films produced no skin irritation or sensitization in the short term. These are expected to become potential materials for the preparation of new antibacterial masks. This work provides a new idea for developing materials with good antibacterial properties for enhancing protection via filtration masks.
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DOI
PubMed
高影响因子
INDUSTRIAL CROPS AND PRODUCTS
·
2023
·
IF 5.9
Chaozhong Xu,Liqun Sun,Shanshan Tong,Jia Ouyang,Xiaoli Gu
This study investigates the cellulase immobilization onto zeolitic imidazolate frameworks (ZIFs) to enable efficient cellulose hydrolysis at high solids loading. Different ZIF carriers (ZIF-8, ZIF-8-NH 2 , Fe 3 O 4 @ZIF-8, and Fe 3 O 4 @ZIF-8-NH 2 ) were prepared and characterized. The resulting ZIF-immobilized cellulases were subsequently analyzed for their loading capacity and enzyme activity , as well as their biochemical properties such as temperature stability, pH stability, storage stability, enzyme leaching, and enzyme kinetics . Results revealed that the cellulase immobilized on Fe 3 O 4 @ZIF-8-NH 2 exhibited an exceptional loading capacity of 359.89 mg/g and a relative enzyme activity of 69.39%. Remarkably, at a solid loading of 15% (w/w) and an enzyme dosage of 5 FPU/g cellulose, the Fe 3 O 4 @ZIF-8-NH 2 immobilized cellulase demonstrated a 20.44% higher hydrolysis yield compared to the free cellulase. Furthermore, this immobilized enzyme system displayed robust reusability, retaining 71.03% of its initial activity even after 10 cycles of reuse. A proposed mechanism of enhanced enzymatic hydrolysis by ZIF-immobilized cellulases was also presented. These findings have significant implications for the future application of ZIF-immobilized cellulases in efficient and cost-effective lignocellulosic bioconversion .
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高影响因子
ACS Applied Nano Materials
·
2023
·
IF 5.9
Meiqin Wu,Yunhui Chen,Hou-Yong Yu,Xiaosong Liu,Yanjuan Dong,Peng-Cheng Qian,Xiaohua Wang
Traditional halogenated flame retardants (FRs) have been severely hindered because they are toxic and hazardous carcinogenic byproducts during their application. In this study, we present a biobased FR composite consisting of cellulose nanocrystals (CNCs) modified with melamine (MEL) and phytic acid (PA) through successive grafting and electrostatic adsorption processes. It was found that the CNC/MEL/PA nanocomposite had a noticeable highly improved thermal blocking performance of the cellulose nanofibril aerogel, excellent carbon layer formation, and high thermal insulation ability because of a synergistic FR effect between the components in both the condensed and gas phases. These findings highlight the potential of nanoscale engineering in producing structural foams with excellent fire-retardant properties using cellulose and other nanosized fibrous biomaterials.
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高影响因子
ChemistrySelect
·
2023
·Vol. 8
·期 41
·e202301040
·
IF 2.1
Shuai Liu,Shun Wang,Xiang Ji,Fengang Zheng,Yuyan Weng
Graphical Solar steam generation is an extremely promising desalination technology that meets the global demand for clean water. Improving solar thermal conversion efficiency and reducing heat loss are key factors in producing efficient solar steam. We have conducted research on reducing heat loss and developed a structure that can minimize heat loss. We achieve a high evaporation rate of 1.622 kg/m 2 h and energy conversion efficiency of 90.8 % under 1 sun irradiation. Solar steam generation (SSG) is an extremely promising desalination technology that meets the global demand for clean water. Herein, we report a facile and effective method that utilizes absorbed heat to evaporate limited water while minimize heat loss. The top layer is a hydrophilic photothermal layer that allows for uniform distribution of water on the photothermal layer, whereas the bottom layer is a hydrophobic insulating layer that provides excellent insulation and heat preservation. Water is supplied by dripping from the top to thoroughly avoid heat loss caused by contact between the photothermal layer and water body. We achieve a high evaporation rate of 1.622 kg/m 2 h and energy conversion efficiency of 90.8 % under 1 sun irradiation.
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高影响因子
GREEN CHEMISTRY
·
2023
·Vol. 25
·期 22
·9322-9334
·
IF 9.8
Shi-Peng Chen,Jin-Long Zhu,Xing-Ru Chen,Zhi-Hao Wang,Yong-Jie Dan,Jing Wang,Sheng-Yang Zhou,Gan-Ji Zhong,Hua-Dong Huang,Zhong-Ming Li
The development of highly efficient and environmentally friendly solvents for dissolving cellulose, which is the most abundant natural polymer on Earth, remains a challenge, hindering its full utilization. Herein, a green protic ionic liquid, 1,1,3,3-tetramethylguanidinium methoxyacetate ([TMGH][MAA]), was found to exhibit attractive capacity to dissolve natural cellulose with an appropriate TMG/MAA molar ratio of 7 : 3 at 80 °C. The solubility of cotton linter and ultra-high molecular weight cotton fibers reached 13% (w/w) and 3% (w/w), respectively, surpassing that of most solvent systems currently used for the dissolution of cellulose. The experimental and simulation results verified that the excellent dissolution ability of [TMGH][MAA] for cellulose is mainly attributed to the destruction of the intrinsic hydrogen-bond networks in cellulose by the synergistic interactions of the [TMGH] cations and [MAA] anions with the hydroxyl groups in the cellulose chains, acting as highly efficient “intermolecular scissors”. The superiority of this novel dissolution system was further demonstrated by the remarkable comprehensive properties of the regenerated cellulose film including satisfactory thermostability, high transparency, and excellent mechanical properties. Furthermore, the satisfactory recovery performance of this solvent highlights its significant feasibility for large-scale industrial manufacturing. The proposed [TMGH][MAA] in this study exhibits great potential as a next-generation processing solvent for dissolving, and thus processing cellulose, promoting the sustainable development of high-value-added cellulose materials.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Na Shi,Jiakun Wu,Xingyu Zhi,Nan Li,Zhining Wang
As a green and economical energy, nuclear power plays a significant role in the global energy supply. Uranium extraction from seawater is a highly promising strategy to utilize unconventional uranium resources and ensure the sustainability of the nuclear industry. However, the current uranium absorbents still suffer from long extraction time, low adsorption capacity, and poor selectivity. In this study, an amidoxime-functionalized cellulose nanofibers/MXene aerogel (MCA) with a three-dimensional porous structure was fabricated for efficient uranium extraction from seawater through electro-/physicochemical adsorption processes. The abundant porous structures and functional groups endowed the MCA with a high adsorption capacity of 515.46 mg/g in the physicochemical adsorption process. Furthermore, the MCA adsorbed 13.82 mg/g of uranium from natural seawater after 28 days with a superior selectivity for uranyl ions. Encouragingly, the uranium extraction performance was significantly boosted via the assistance of an electric field. By applying a voltage of 1.0 V, the MCA presented an improved extraction capacity of 1826.38 mg/g and accelerated adsorption kinetic. Meanwhile, the MCA electrode possessed good stability and high reusability of 84.30% after five adsorption–desorption cycles, which insured that MCA was a promising uranium adsorbent in long-term application. This work offers a universal paradigm for the design of highly efficient electro-adsorbents and also expands the scope of external field enhancement in the area of uranium extraction.
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高影响因子
PROGRESS IN ORGANIC COATINGS
·
2023
·
IF 6.6
Shuang-Mei He,Fang Wang,Lin Zhang,Jia-Yan Zhang,Fu-Rong Zeng,Bo-Wen Liu,Yan-Bing Luo,Yu-Zhong Wang,Hai-Bo Zhao
Cellulose-based paper is widely used in cultural communication, art appreciation, and cultural relic protection, but is susceptible to fire and mildew. Traditional protective materials have negative impacts on the appearance, flexibility, and writability of paper, resulting in severely limited applications. Herein, we demonstrate a quick and effective approach for enhancing the flame retardancy, antibacterial, and antifungal properties of cellulose papers by assembling polyhexamethylene biguanide (PHMB) and sodium polyphosphate (PSP). By exploiting hydrogen bonding and electrostatic interactions , PHMB and PSP can assemble into micro-nano protuberances that are deposited on the surface of the paper through a 30 s dip-treating technology. The PHMB/PSP layers promote the formation of char layer when exposed to flame, providing the paper with self-extinguishing property with a limiting oxygen index value of 34.5 % and an 84.0 % reduction in peak heat release rate. Meanwhile, the treated papers exhibit excellent antibacterial activity against S. aureus (>99.99 %) and appreciable fungal resistance against T. viride (Grade 1). Importantly, the treatment does not alter the appearance, mechanical stability, and writability of the paper. Owing to the mild conditions and fast processability, this study promotes the wide development of advanced high-performance cellulose paper with combined fire-safety, antibacterial, and antifungal properties for diverse applications.
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高影响因子
Sustainability
·
2023
·Vol. 15
·期 18
·13382
·
IF 3.9
Qihang Dai,Ju Liu,Junjie Zheng,Bo Fu
Metal–organic frameworks (MOFs) hold great potential for efficient removal of particulate matter (PM) due to their high porosity and tunable surface groups. In this work, sustainable bacterial cellulose (BC) was employed as a substrate for Zr-based MOF (i.e., UiO-66-NH2) deposition. Specifically, the UiO-66-NH2@BC aerogel exhibits a multi-level pore structure with a specific surface area of 103 m2/g. Pristine BC aerogels indicated a removal efficiency of 50.6% for PM2.5, with a pressure drop of 22.8 Pa. While UiO-66-NH2@BC aerogels showed a PM2.5removal efficiency of 96.9%. The filtration mechanism can be assigned to the following reasons: (i) the interception/impaction of PM with the fibrous and porous aerogel network; and (ii) the presence of polar amine groups that boost electrostatic interactions between PM and MOFs. Moreover, as-prepared filters can be regenerated in a facile way with good reusability and long-term stability.
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高影响因子
危险品化学品经营许可证（带存储）